%0 Journal Article %T New Algorithm for Upgrading of Portal Radiation Monitors with Plastic Detectors. Part 4. Improvement of Algorithm by Using of Collimators %A Stavrov, A.I. %K portal radiation monitor, collimator, minimum detectable activity, distance of detection of radioactive source %J ANRI %D 2022 %N 0 %P 8 %I Scientific-Production Enterprise “Dosa”